Combined chuck and countersink.



No. mama Patented Dec. l6, I902. J. J. BELL.

COMBINED CHUCK AND COUNTERSIN K.

' (Application filed 'Apr. 4, 1900.)

(No Mo del.)

- JASON-J. BELL, OF GARDEN PRAIRIE,

PATENT UFFICE.

ILLINOIS, ASSIGNOR OF ONE-HALF TO AURELIUS G. WHITE, OF GARDEN PRAIRIE, ILLINOIS.

COMBINED CHU CK AND COUNTERSINK.

SPECIFICATION forming part of Letters Patent No. 716,177, dated December 16, 1902..

Application filed April 4, 1900 T at whom it may concern:

Be it known that I, JASON J. BELL, a citizen of theUnited States, residing at Garden Prai-' rie, in the county of Boone and State of Illinois, have invented certain new and useful Improvements in a Combined Chuck and Countersink, of which the following is a specification.

The object of this invention is to form the [O jaws of a drill-holding chuck in countersink) .form in order that a hole may be drilled and formed with a countersink at a single downward movement ofthe drill.

In the accompanying drawings, Figure 1 is an isometrical representation of myimproved combined chuck and countersink as seen from the top. Fig. 2 is a similar view as seen from the under face. Fig. 3 is an elevation, the clamping-nut being shown in section. Fig. 4 is a longitudinal section of the device, taken on a plane passing through one of the slits.

The chuck is formed of a hollow shank having a lengthwise opening 2. The shank con sists of an integral structure constructed with a pair of cylindrical portions 1 3 and a tapering portion 4. The cylindrical portion 3 is. of greater diameter than the cylindrical portion 1 and is arranged at one end of the latter, as well as being exteriorly screw-thread- 0 ed. The tapering portion 4 is arranged at the other end of the cylindrical portion 3, and the latter, as well as the former, is suitably.) slitted from end to end, which forms the said portions 3 and i into a plurality-of elastic, gripping and cutting jaws 6, these latter hav f I ing their ends provided with a cut-away por} tion to form cutting edges for making the countersinks.

The reference-numeral 5 denotes a clamping-nut mounted upon the screw-threads of the cylindrical portions 3 and engaging the jaws 6 for clamping them in position. A drill 7 is inserted between the jaws of the chuck, I and by turningthe nut 5 in connection with the jaws the jaws will clamp the drill and hold it in connection with the chuck. The

Serial No. 11,558. (No model.)

drilled, the jaws of the chuck will come in ,contact with the material and form a countersink in the material without the drill being withdrawn from the material. The drill can be extended more or less, as required for drilling, and the countersink is always ready to perform its work without any especial preparations or handling of tools.

I claim as my invention-- 1. A combined drill-chuck and countersink comprising a drill-receiving hollow shank provided with a pair of cylindrical portions ofdiiferent diameters and a tapering portion at one end of the cylindrical portion of larger diameter, said tapering portion provided with cutting edges to form a countersink and said cylindrical portion of larger diameter externally screw-threaded, said cylindrical portion of larger diameter and said tapering portion provided with a plurality of slits extending from end to end thereof forming the said tapering portion into a plurality of elastic cutting-jaws and the portion of larger diameter into a plurality of gripping-jaws, and a clampingnut mounted on said cylindrical portion of larger diameter and engaging the jaws for compressing them around the drill and clamping the latter in position.

:2. In combination a shank provided with a plurality of elastic gripping and cutting jaws for forming a countersink, a drill mounted in the shank and projecting from the cutting edges of the jaws, and means mounted upon the shank for compressing the elastic cuttingjaws tightly around said drill and clamping the latter within the shank.

JASON J. BELL. 

